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annotate src/edl.c @ 3:bd99b6549eb4

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*: expand in readme and rename src/main to src/edl
author Paper <mrpapersonic@gmail.com>
date Sun, 24 Dec 2023 20:22:54 -0500
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children c2408abb258a
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bd99b6549eb4 *: expand in readme and rename src/main to src/edl
Paper <mrpapersonic@gmail.com>
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1 #include <string.h>
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2 #include <stdbool.h>
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3 #include <stdio.h>
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4 #include <stdlib.h>
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5 #include <stdint.h>
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6 #include "edl.h"
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7
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8 #define strnchr(haystack, needle, length) (char*)memchr(haystack, needle, strnlen(haystack, length))
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9
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10 static uint32_t EDL_internal_crcn32b(const unsigned char* restrict message, size_t length) {
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11 uint32_t crc = 0xFFFFFFFF;
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12
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13 size_t i;
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14 for (i = 0; i < length && message[i]; i++) {
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15 crc = crc ^ message[i];
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16 size_t j;
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17 for (j = 0; j < 8; j++)
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18 crc = (crc >> 1) ^ (0xEDB88320 & -(crc & 1));
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19 }
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20
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21 return ~crc;
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22 }
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23
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24 /* This parses the first line of the EDL and
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25 * creates an array with CRC32 hashes in
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26 * the order of the strings.
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27 */
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28 static uint32_t* EDL_internal_parse_first_line(const char* data, size_t* restrict length) {
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29 size_t hashes_size = 32, current_hash = 0;
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30 uint32_t* hashes = malloc(hashes_size * sizeof(uint32_t));
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31
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32 size_t len_until_newline = strchr(data, '\n') - data, i, b;
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33 for (i = 0, b = 0; i < len_until_newline; i++, b++) {
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34 if (data[i] == ';') {
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35 if (current_hash >= hashes_size)
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36 hashes = realloc(hashes, (hashes_size *= 2) * sizeof(uint32_t));
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37 hashes[current_hash++] = EDL_internal_crcn32b((const unsigned char*)&data[i - b], b);
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38 b = -1; // ew
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39 }
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40 }
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41
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42 *length = current_hash;
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43
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44 return hashes;
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45 }
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46
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47 /* -- Functions to extract different datatypes -- */
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48
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49 static size_t EDL_internal_append_offset(const char* input, size_t offset, size_t length) {
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50 size_t s = 0;
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51
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52 s += strchr(&input[offset + s], ';') - &input[offset];
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53 if (s + offset > length)
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54 return s;
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55
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56 s += strspn(&input[offset + s], ";\t ");
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57 if (s + offset > length)
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58 return s;
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59
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60 return s;
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61 }
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62
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63 static size_t EDL_internal_get_int(const char* input, size_t offset, size_t length, int* int_return) {
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64 if (offset > length)
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65 return 0;
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66
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67 {
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68 char* ptr_return;
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69 *int_return = strtol(&input[offset], &ptr_return, 10);
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70
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71 if (!ptr_return)
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72 return 0;
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73 }
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74
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75 return EDL_internal_append_offset(input, offset, length);
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76 }
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77
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78 static size_t EDL_internal_get_double(const char* input, size_t offset, size_t length, double* double_return) {
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79 if (offset > length)
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80 return 0;
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81
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82 {
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83 char* ptr_return;
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84 *double_return = strtod(&input[offset], &ptr_return);
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85
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86 if (!ptr_return)
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87 return 0;
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88 }
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89
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90 return EDL_internal_append_offset(input, offset, length);
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91 }
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92
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93 static size_t EDL_internal_get_bool(const char* input, size_t offset, size_t length, bool* bool_return) {
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94 if (offset > length)
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95 return 0;
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96
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97 if (strncmp((input + offset), "TRUE", 4))
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98 *bool_return = true;
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99 else if (strncmp((input + offset), "FALSE", 5))
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100 *bool_return = false;
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101
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102 return EDL_internal_append_offset(input, offset, length);
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103 }
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104
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105 static size_t EDL_internal_get_media_type(const char* input, size_t offset, size_t length, MediaType* media_return) {
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106 if (offset > length)
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107 return 0;
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108
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109 if (strncmp(input + offset, "VIDEO", 5))
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110 *media_return = MEDIATYPE_VIDEO;
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111 else if (strncmp(input + offset, "AUDIO", 5))
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112 *media_return = MEDIATYPE_AUDIO;
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113
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114 return EDL_internal_append_offset(input, offset, length);
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115 }
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116
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117 static size_t EDL_internal_get_string(const char* input, size_t offset, size_t length, char** string_return) {
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118 /* Windows filenames will *NEVER* include double quotes.
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119 This might break with EDL files created with Reaper on Linux. */
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120 if (offset > length)
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121 return 0;
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122
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123 size_t start = strchr(&input[offset], '\"') - &input[offset] + 1;
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124 if (start + offset > length)
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125 return 0;
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126
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127 size_t s_length = strchr(&input[offset + start], '\"') - &input[offset] - start;
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128 if (start + s_length + offset > length)
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129 return 0;
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130
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131 *string_return = malloc((s_length + 1) * sizeof(char));
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132 if (!*string_return)
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133 return 0;
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134
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135 memcpy(*string_return, &input[offset + start], s_length);
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Paper <mrpapersonic@gmail.com>
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diff changeset
136 (*string_return)[s_length] = '\0';
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diff changeset
137
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diff changeset
138 return EDL_internal_append_offset(input, offset, length);
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139 }
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140
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Paper <mrpapersonic@gmail.com>
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141 /* memory management routines */
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142
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Paper <mrpapersonic@gmail.com>
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143 static int EDL_internal_reallocate(EDL_file* input, size_t new_capacity) {
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144 input->arr = realloc(input->arr, new_capacity * sizeof(EDL_line));
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diff changeset
145 if (!input->arr)
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146 return 0;
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147
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148 if (new_capacity > input->capacity)
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149 memset(input->arr + input->capacity, 0, new_capacity - input->capacity);
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150
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151 input->capacity = new_capacity;
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152
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153 return 1;
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154 }
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155
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156 static int EDL_internal_allocate_memory(EDL_file* input) {
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157 return EDL_internal_reallocate(input, input->capacity ? input->capacity * 2 : 16);
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158 }
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159
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160 static int EDL_internal_shrink_memory_to_fit(EDL_file* input) {
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161 return EDL_internal_reallocate(input, input->size);
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162 }
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163
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164 /* the important function */
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165 EDL_file EDL_parse(const char* data, size_t length) {
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166 EDL_file edl = {0};
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167 if (!EDL_internal_allocate_memory(&edl))
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168 return edl;
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169
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170 size_t order_size = 0;
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171 uint32_t* order = EDL_internal_parse_first_line(data, &order_size);
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172
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173 size_t offset = strnchr(data, '\n', length) - data + 1;
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174 while ((offset = strnchr(data + offset, '\n', length - offset) - data + 1) < length) {
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175 size_t local_offset = offset; // this is so our original offset stays intact
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176
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177 bool ok = true;
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178
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179 for (int i = 0; i < order_size; i++) {
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180 #define ADD_TO_OFFSET(x, a) \
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181 { \
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182 size_t o = a(data, local_offset, length, &edl.arr[edl.size].x); \
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183 if (!o) \
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184 ok = false; \
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185 local_offset += o; \
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186 }
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187 switch (order[i]) {
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188 case 0x1541c503: /* ID */
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189 ADD_TO_OFFSET(id, EDL_internal_get_int);
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190 break;
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191 case 0x4b211812: /* Track */
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Paper <mrpapersonic@gmail.com>
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192 ADD_TO_OFFSET(track, EDL_internal_get_int);
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193 break;
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194 case 0xbb46516f: /* StartTime */
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195 ADD_TO_OFFSET(start_time, EDL_internal_get_double);
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196 break;
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197 case 0xaeac5df7: /* Length */
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198 ADD_TO_OFFSET(length, EDL_internal_get_double);
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199 break;
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200 case 0x03834606: /* PlayRate */
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201 ADD_TO_OFFSET(play_rate, EDL_internal_get_double);
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202 break;
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203 case 0x0c2083d3: /* Locked */
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204 ADD_TO_OFFSET(locked, EDL_internal_get_bool);
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205 break;
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206 case 0xe60c8b1d: /* Normalized */
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Paper <mrpapersonic@gmail.com>
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207 ADD_TO_OFFSET(normalized, EDL_internal_get_bool);
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208 break;
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209 case 0xbe5802c9: /* StretchMethod */
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Paper <mrpapersonic@gmail.com>
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210 ADD_TO_OFFSET(stretch_method, EDL_internal_get_int);
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Paper <mrpapersonic@gmail.com>
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211 break;
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212 case 0x4ec8be4c: /* Looped */
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Paper <mrpapersonic@gmail.com>
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213 ADD_TO_OFFSET(looped, EDL_internal_get_bool);
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214 break;
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215 case 0xe6cb84d1: /* OnRuler */
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Paper <mrpapersonic@gmail.com>
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216 ADD_TO_OFFSET(on_ruler, EDL_internal_get_bool);
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Paper <mrpapersonic@gmail.com>
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217 break;
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218 case 0x035f84c2: /* MediaType */
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Paper <mrpapersonic@gmail.com>
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219 ADD_TO_OFFSET(media_type, EDL_internal_get_media_type);
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Paper <mrpapersonic@gmail.com>
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220 break;
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221 case 0x379d32c5: /* FileName */
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Paper <mrpapersonic@gmail.com>
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222 ADD_TO_OFFSET(filename, EDL_internal_get_string);
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Paper <mrpapersonic@gmail.com>
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223 break;
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224 case 0x9f334738: /* Stream */
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Paper <mrpapersonic@gmail.com>
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225 ADD_TO_OFFSET(stream, EDL_internal_get_int);
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226 break;
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227 case 0x07b4e0e7: /* StreamStart */
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228 ADD_TO_OFFSET(stream_start, EDL_internal_get_double);
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229 break;
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230 case 0x8f16c7b8: /* StreamLength */
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Paper <mrpapersonic@gmail.com>
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231 ADD_TO_OFFSET(stream_length, EDL_internal_get_double);
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232 break;
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233 case 0xd2edd7e4: /* FadeTimeIn */
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Paper <mrpapersonic@gmail.com>
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234 ADD_TO_OFFSET(fade_time_in, EDL_internal_get_double);
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Paper <mrpapersonic@gmail.com>
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235 break;
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Paper <mrpapersonic@gmail.com>
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236 case 0x792e8c40: /* FadeTimeOut */
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Paper <mrpapersonic@gmail.com>
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237 ADD_TO_OFFSET(fade_time_out, EDL_internal_get_double);
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Paper <mrpapersonic@gmail.com>
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238 break;
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Paper <mrpapersonic@gmail.com>
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239 case 0x98374657: /* SustainGain */
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Paper <mrpapersonic@gmail.com>
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240 ADD_TO_OFFSET(sustain_gain, EDL_internal_get_double);
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Paper <mrpapersonic@gmail.com>
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241 break;
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242 case 0x3e998b1f: /* CurveIn */
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Paper <mrpapersonic@gmail.com>
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243 ADD_TO_OFFSET(curve_in, EDL_internal_get_int);
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244 break;
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245 case 0x82fb09c4: /* GainIn */
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Paper <mrpapersonic@gmail.com>
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246 ADD_TO_OFFSET(gain_in, EDL_internal_get_double);
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Paper <mrpapersonic@gmail.com>
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247 break;
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248 case 0x53add388: /* CurveOut */
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Paper <mrpapersonic@gmail.com>
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249 ADD_TO_OFFSET(curve_out, EDL_internal_get_int);
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250 break;
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251 case 0x4210ba56: /* GainOut */
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Paper <mrpapersonic@gmail.com>
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252 ADD_TO_OFFSET(gain_out, EDL_internal_get_double);
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Paper <mrpapersonic@gmail.com>
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253 break;
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254 case 0x89c4df6c: /* Layer */
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Paper <mrpapersonic@gmail.com>
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255 ADD_TO_OFFSET(layer, EDL_internal_get_int);
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256 break;
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257 case 0xadf2f1a3: /* Color */
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Paper <mrpapersonic@gmail.com>
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258 ADD_TO_OFFSET(color, EDL_internal_get_int);
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259 break;
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260 case 0xa56b43e1: /* CurveInR */
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Paper <mrpapersonic@gmail.com>
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261 ADD_TO_OFFSET(curve_in_r, EDL_internal_get_int);
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Paper <mrpapersonic@gmail.com>
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262 break;
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263 case 0xcb6d715e: /* CurveOutR */
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Paper <mrpapersonic@gmail.com>
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264 ADD_TO_OFFSET(curve_out_r, EDL_internal_get_int);
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Paper <mrpapersonic@gmail.com>
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265 break;
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266 case 0x9da1b9ed: /* PlayPitch */
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Paper <mrpapersonic@gmail.com>
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267 ADD_TO_OFFSET(play_pitch, EDL_internal_get_double);
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268 break;
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269 case 0x2bda6ed4: /* LockPitch */
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270 ADD_TO_OFFSET(lock_pitch, EDL_internal_get_bool);
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271 break;
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272 case 0x3071a4c6: /* FirstChannel */
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273 ADD_TO_OFFSET(first_channel, EDL_internal_get_int);
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274 break;
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275 case 0x7de1bd40: /* Channels */
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276 ADD_TO_OFFSET(channels, EDL_internal_get_int);
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277 break;
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278 default:
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279 /* ... what */
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280 break;
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281 }
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282 }
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283
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284 if (!ok)
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285 break;
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286
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287 if (++edl.size >= edl.capacity)
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288 EDL_internal_allocate_memory(&edl);
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289 }
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290
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291 EDL_internal_shrink_memory_to_fit(&edl);
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292
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293 free(order);
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294
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295 return edl;
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296 }
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297
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298 void EDL_free(EDL_file file) {
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299 size_t i;
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300 for (i = 0; i < file.size; i++) {
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301 if (file.arr[i].filename)
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302 free(file.arr[i].filename);
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303 }
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304 free(file.arr);
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305 }